diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -3354,10 +3354,10 @@
 def ffuchsia_api_level_EQ : Joined<["-"], "ffuchsia-api-level=">,
   Group<m_Group>, Flags<[CC1Option]>, HelpText<"Set Fuchsia API level">,
   MarshallingInfoInt<LangOpts<"FuchsiaAPILevel">>;
-def mmacosx_version_min_EQ : Joined<["-"], "mmacosx-version-min=">,
-  Group<m_Group>, HelpText<"Set Mac OS X deployment target">;
 def mmacos_version_min_EQ : Joined<["-"], "mmacos-version-min=">,
-  Group<m_Group>, Alias<mmacosx_version_min_EQ>;
+  Group<m_Group>, HelpText<"Set macOS deployment target">;
+def : Joined<["-"], "mmacosx-version-min=">,
+  Group<m_Group>, Alias<mmacos_version_min_EQ>;
 def mms_bitfields : Flag<["-"], "mms-bitfields">, Group<m_Group>, Flags<[CC1Option]>,
   HelpText<"Set the default structure layout to be compatible with the Microsoft compiler standard">,
   MarshallingInfoFlag<LangOpts<"MSBitfields">>;
diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1551,7 +1551,7 @@
     options::ID Opt;
     switch (Platform) {
     case DarwinPlatformKind::MacOS:
-      Opt = options::OPT_mmacosx_version_min_EQ;
+      Opt = options::OPT_mmacos_version_min_EQ;
       break;
     case DarwinPlatformKind::IPhoneOS:
       Opt = options::OPT_miphoneos_version_min_EQ;
@@ -1727,7 +1727,7 @@
 Optional<DarwinPlatform>
 getDeploymentTargetFromOSVersionArg(DerivedArgList &Args,
                                     const Driver &TheDriver) {
-  Arg *OSXVersion = Args.getLastArg(options::OPT_mmacosx_version_min_EQ);
+  Arg *macOSVersion = Args.getLastArg(options::OPT_mmacos_version_min_EQ);
   Arg *iOSVersion = Args.getLastArg(options::OPT_miphoneos_version_min_EQ,
                                     options::OPT_mios_simulator_version_min_EQ);
   Arg *TvOSVersion =
@@ -1736,15 +1736,15 @@
   Arg *WatchOSVersion =
       Args.getLastArg(options::OPT_mwatchos_version_min_EQ,
                       options::OPT_mwatchos_simulator_version_min_EQ);
-  if (OSXVersion) {
+  if (macOSVersion) {
     if (iOSVersion || TvOSVersion || WatchOSVersion) {
       TheDriver.Diag(diag::err_drv_argument_not_allowed_with)
-          << OSXVersion->getAsString(Args)
+          << macOSVersion->getAsString(Args)
           << (iOSVersion ? iOSVersion
                          : TvOSVersion ? TvOSVersion : WatchOSVersion)
                  ->getAsString(Args);
     }
-    return DarwinPlatform::createOSVersionArg(Darwin::MacOS, OSXVersion);
+    return DarwinPlatform::createOSVersionArg(Darwin::MacOS, macOSVersion);
   } else if (iOSVersion) {
     if (TvOSVersion || WatchOSVersion) {
       TheDriver.Diag(diag::err_drv_argument_not_allowed_with)
diff --git a/clang/test/Driver/darwin-debug-flags.c b/clang/test/Driver/darwin-debug-flags.c
--- a/clang/test/Driver/darwin-debug-flags.c
+++ b/clang/test/Driver/darwin-debug-flags.c
@@ -9,7 +9,7 @@
 // CHECK-SAME:                flags:
 // CHECK-SAME:                -I path\\ with\\ \\\\spaces
 // CHECK-SAME:                -g -Os
-// CHECK-SAME:                -mmacosx-version-min=10.5.0
+// CHECK-SAME:                -mmacos-version-min=10.5.0
 
 int x;